Low-residual ultrafilter for silica sol

Abstract

The application discloses a low-residual special ultrafilter for silica sol and relates to the technical field of ultrafilters.The special ultrafilter for silica sol comprises a shell, a discharge pipe is fixed to the side edge of the shell, the upper end of the shell is connected with an upper end cover through a flange and bolts, and a liquid outlet pipe is installed on the upper end of the upper end cover.The special ultrafilter for silica sol is provided with a special pressure-stabilizing shunt mechanism, a semicircular flow-equalizing shell in the lower end cover is used for buffering and noise reduction of high-speed incoming silica sol stock solution, and direct impact of the stock solution is avoided to form turbulent flow;after the stock solution is uniformly overflowed through an overflow port, the stock solution is uniformly shunted to the interiors of all ultrafilter cores through multiple groups of connecting pipes which are in the same height and are flush with each other, multiple filter cores are simultaneously and equally fed, the problem of single-flow direct impact and uneven distribution of liquid flow of traditional equipment is solved, the filtering load of each filter core is uniform, the filtering rate is consistent, the problems of incomplete local filtering and material retention and residue are effectively avoided, and the overall filtering and concentration precision of silica sol and the quality of finished products are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of ultrafiltration technology, specifically to an ultrafiltration machine for low-residue silica sol. Background Technology

[0002] Silica sol is a colloidal solution formed by dispersing nano-silica particles in water. It has advantages such as being non-toxic, heat-resistant, having strong adhesion, and good chemical stability. It is widely used in many fields such as precision casting, coatings, electronics, ceramics, and chemicals. In the industrial production of silica sol, ultrafiltration filtration concentration is the core process. It is mainly used to remove free water, trace impurities, and large molecular flocculents from the silica sol stock solution, thereby increasing the solid content and purity of the silica sol and ensuring the quality of the finished product. Currently, conventional ultrafiltration machines used in the industry have many shortcomings in silica sol filtration operations: 1. The existing ultrafiltration machine has a straight-in flow channel inlet structure. When the silica sol raw liquid is rushed into the equipment at high speed, it is easy to generate turbulence and eddies, resulting in uneven liquid distribution. The liquid inlet volume of each filter element varies greatly. Some filter elements are overloaded and do not filter fully, while others have low utilization. This not only causes inconsistent filtration efficiency, but also makes it easy to have a large amount of local filtration residue, which greatly reduces the effect of silica sol concentration and purification. 2. Silica sol contains nano-sized colloidal particles, which are easily adsorbed and accumulated on the inner wall and pores of the ultrafiltration cartridge during filtration. Traditional ultrafiltration machines lack active anti-clogging structures, resulting in frequent cartridge clogging problems. Once the cartridge is clogged, it directly blocks the liquid flow path, causing a sudden increase in equipment filtration pressure and a sharp decrease in liquid output. This not only reduces production continuity but also causes silica sol material to remain, significantly increasing material loss. Furthermore, frequent clogging requires manual shutdown for disassembly and cleaning of the cartridge, greatly increasing equipment maintenance and labor costs, and severely restricting the automated and continuous operation of the production line. 3. Existing ultrafiltration equipment does not have an adaptive flow rate adjustment function. When a single filter element is blocked, it cannot automatically adjust the inlet flow rate of the corresponding flow channel, which will cause the overall filtration of the equipment to be unbalanced. Some unblocked filter elements will work under overload, accelerating the aging and wear of the filter elements. The equipment has poor operating stability and cannot meet the production requirements of high-precision, low-residue, and continuous production of high-quality silica sol. Summary of the Invention

[0003] The purpose of this invention is to provide a low-residue ultrafiltration machine specifically for silica sol, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-residue silica sol-specific ultrafiltration machine, comprising a shell, a discharge pipe fixed on the side of the shell, the upper end of the shell being connected to an upper end cover via a flange and bolts, an outlet pipe being installed on the upper end of the upper end cover, the lower end of the shell being connected to a lower end cover via a flange and bolts, and a pressure stabilizing and diverting mechanism being installed inside the lower end cover, an inlet pipe being installed on the lower end of the lower end cover, and a self-vibrating anti-clogging filter assembly being installed inside the shell.

[0005] Preferably, a horizontal plate is fixed inside the upper cover, and a rotating shaft is rotatably connected to the horizontal plate. A blade is fixed to the upper end of the rotating shaft, and a fixed rod is fixed to the lower end of the rotating shaft. An arc-shaped block is fixed on the fixed rod. Under the action of fluid, the blade can drive the rotating shaft to rotate, thereby driving the fixed rod and the arc-shaped block to rotate, thus ensuring the normal operation of the device.

[0006] Preferably, the pressure stabilizing and diverting mechanism includes a flow equalization shell fixed inside the lower end cover. The side of the flow equalization shell facing the liquid inlet pipe has a semi-circular structure, and several overflow ports are opened at equal angles on the flow equalization shell. At the same time, several connecting pipes are also evenly fixed on the flow equalization shell. The lower end face of the connecting pipe is higher than the lower end face of the overflow port, and a sealing gasket is fixed inside the connecting pipe. Through the function of the flow equalization shell, the material entering through the liquid inlet pipe can be effectively buffered. With the function of the overflow port and the connecting pipe, uniform diversion can be achieved, ensuring that the material is evenly contacted with the ultrafiltration element to achieve filtration and concentration, and effectively extending the service life of the ultrafiltration element.

[0007] Preferably, the connecting pipe has a frustum hole, and the frustum hole cooperates with the sealing plug to achieve the function of flow channel adjustment. By cooperating with the sealing plug, the flow channel opening can be adjusted, thereby providing a basic guarantee for the automatic unclogging of the ultrafiltration element.

[0008] Preferably, the sealing plug is fixed on the slide rod, and the slide rod is connected to the support plate. The support plate is fixed inside the connecting pipe, and the support plate is fixed to one end of the first spring. The other end of the first spring is fixed to the slide rod. When the sealing plug moves, the sliding guide between the slide rod and the support plate can ensure the stability of the sealing plug's movement. The elasticity of the first spring can provide a basic force for the automatic reset of the sealing plug, ensuring the normal operation of the device.

[0009] Preferably, the filter assembly includes an upper circular plate fixed to the outer shell, and an upper guide tube is uniformly fixed on the upper circular plate. An upper limit ring plate is also fixed at the lower end of the upper guide tube. The upper limit ring plate and the upper mounting plate are slidably connected. Through the function of the upper guide tube, the normal flow of liquid can be ensured, thereby ensuring the normal operation of the device. Furthermore, through the sliding action between the upper limit ring plate and the upper mounting plate, a basic guarantee can be provided for the vibration cleaning of the ultrafiltration element.

[0010] Preferably, the upper mounting plate is fixed to one end of the ultrafiltration element, and the other end of the ultrafiltration element is fixed to the lower mounting plate. A connecting rod is fixed between the lower mounting plate and the upper mounting plate. Connecting sleeves are fixed on both the lower and upper mounting plates. The connecting sleeves and ultrafiltration elements are distributed in a one-to-one correspondence. The connecting sleeves on the upper mounting plate are slidably connected to the upper guide tube. Through the action of the ultrafiltration element, the water in the silica sol can be filtered, thereby achieving the concentration of the silica sol. Through the action of the connecting rod, the upper and lower mounting plates can move synchronously, thereby avoiding stretching damage to the ultrafiltration element during vibration and clogging, and effectively ensuring the service life of the ultrafiltration element.

[0011] Preferably, the upper mounting plate is also slidably connected to guide rods on the left and right sides, and the guide rods are slidably connected to the upper circular plate. When the upper mounting plate moves, the sliding guidance between the guide rods and the upper circular plate can ensure the stability of the movement of the upper mounting plate.

[0012] Preferably, a fixing plate is fixed on the guide rod, and a convex shaft is fixed on the fixing plate. The convex shaft and the arc-shaped block form a sliding connection. At the same time, a second spring is fixed between the fixing plate and the upper circular plate. Through the sliding action between the convex shaft and the arc-shaped block, a basic force can be provided for the movement of the guide rod and the upper mounting plate. In conjunction with the elastic action of the second spring, a basic guarantee can be provided for the automatic reset of the guide rod and the upper mounting plate.

[0013] Preferably, the lower mounting plate and the lower limiting ring plate are slidably connected, and the lower limiting ring plate is fixed on the lower circular plate, which is fixed inside the outer shell. Simultaneously, lower guide pipes are evenly fixed on the lower circular plate. The lower guide pipes are slidably connected to the connecting sleeves on the lower mounting plate, and the lower guide pipes and connecting sleeves are distributed in a one-to-one correspondence. Furthermore, the lower guide pipes and connecting pipes are nested together, and the lower guide pipes are also distributed in a one-to-one correspondence. The lower guide pipes are sealed to the connecting pipes through a sealing gasket. This structure ensures the normal flow of materials, thereby guaranteeing the normal operation of the device.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This low-residue silica sol-specific ultrafiltration machine is equipped with a dedicated pressure-stabilizing and flow-dividing mechanism. The semi-circular flow equalization shell inside the lower end cover buffers and reduces noise when the silica sol raw solution enters at high speed, preventing the raw solution from directly rushing in and forming turbulence. After the raw solution overflows evenly through the overflow port, it is evenly distributed to each ultrafiltration element through multiple sets of connecting pipes of equal height, realizing synchronous and equal feeding of multiple filter elements. This completely solves the problems of single-flow direct rush and uneven liquid distribution in traditional equipment. Each filter element has a uniform filtration load and consistent filtration rate, effectively avoiding the problems of incomplete filtration and material retention, and significantly improving the overall filtration and concentration accuracy of silica sol and the quality of the finished product. 2. This low-residue silica sol-specific ultrafiltration machine features an adaptive flow regulation structure inside the connecting pipe, consisting of a frustum orifice, a sealing plug, a sliding rod, and a first spring. When a single ultrafiltration element becomes clogged and the liquid flow resistance increases, the liquid flow impact force in the corresponding flow channel decreases. The first spring pushes the sealing plug to automatically reset, expanding the flow channel diameter and increasing the feed rate of the clogged filter element's corresponding flow channel, thus compensating for the flow loss caused by the clogging. When the filter element is working normally, the liquid flow impact force can maintain stable conduction of the sealing plug, ensuring normal filtration flow. This structure can adaptively adjust the flow rate of a single flow channel in real time, balancing the filtration load of each filter element and preventing the entire machine from becoming paralyzed due to the clogging of a single filter element. It eliminates the need for manual real-time control, significantly improving the equipment's operational stability and continuous production capacity. 3. This low-residue silica sol-specific ultrafiltration machine utilizes the kinetic energy of the filtered silica sol to drive the blades to rotate, which in turn drives the arc-shaped block to rotate continuously. Through the intermittent sliding cooperation between the arc-shaped block and the convex shaft, combined with the elastic reset action of the second spring, the entire ultrafiltration element is driven to vibrate rhythmically up and down. During the filtration process, the filter element continuously vibrates, which can effectively shake off silica sol colloidal particles and impurities adsorbed and accumulated in the inner wall and pores of the filter element, preventing filter element pore blockage from the root and achieving a continuous self-cleaning effect. There is no need for frequent shutdowns to disassemble and clean the filter element, which greatly reduces the frequency of equipment downtime and manual maintenance costs. At the same time, the support and limit design of the connecting rod can prevent the filter element from being stretched, deformed, or broken during vibration, ensuring the safety of the filter element structure and effectively extending the service life of the filter element. 4. This low-residue silica sol-specific ultrafiltration machine has a regular structure and good flow channel matching. Multiple units can be connected in series according to the silica sol concentration accuracy requirements to achieve multi-stage gradient filtration and concentration of silica sol. This can further reduce material residue, improve the solid content and purity of silica sol, and is suitable for the production standards of high-end electronics, precision casting and other high-quality silica sol. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 2 This is a frontal cross-sectional three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 3 This is a three-dimensional structural diagram of the outer shell of the present invention, viewed from the front and in cross-section. Figure 4 This is a frontal cross-sectional three-dimensional structural diagram of the upper end cover of the present invention; Figure 5 This is a frontal cross-sectional three-dimensional structural diagram of the lower end cap of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a frontal cross-sectional three-dimensional structural diagram of the filter assembly of the present invention; Figure 8 This is a top-view three-dimensional structural diagram of the filter assembly of the present invention; Figure 9 This is a schematic diagram of the series structure of the device of the present invention.

[0016] In the diagram: 1. Outer shell; 2. Discharge pipe; 3. Upper end cover; 301. Horizontal plate; 302. Rotating shaft; 303. Blade; 304. Fixing rod; 305. Arc block; 4. Liquid outlet pipe; 5. Lower end cover; 501. Flow equalization shell; 502. Overflow port; 503. Connecting pipe; 504. Sealing gasket; 505. Frustum hole; 506. Sealing plug; 507. Slide rod; 508. Support plate; 509. First spring; 6. Liquid inlet pipe; 7. Filter assembly; 701. Upper circular plate; 702. Upper guide pipe; 703. Upper limit ring plate; 704. Upper mounting plate; 705. Ultrafiltration element; 706. Lower mounting plate; 707. Connecting rod; 708. Connecting sleeve; 709. Guide rod; 710. Fixing plate; 711. Protruding shaft; 712. Second spring; 713. Lower limit ring plate; 714. Lower circular plate; 715. Lower guide pipe. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-9 The present invention provides a technical solution: a low-residue silica sol-specific ultrafiltration machine, comprising a shell 1, a discharge pipe 2 fixed on the side of the shell 1, the upper end of the shell 1 being connected to the upper end cover 3 by a flange and bolts, the upper end of the upper end cover 3 being equipped with a liquid outlet pipe 4, the lower end of the shell 1 being connected to the lower end cover 5 by a flange and bolts, and the lower end cover 5 being equipped with a pressure stabilizing and diverting mechanism, the lower end of the lower end cover 5 being equipped with a liquid inlet pipe 6, and the shell 1 being equipped with a self-vibrating anti-clogging filter assembly 7.

[0019] The pressure stabilizing and diverting mechanism includes a flow equalization shell 501 fixed inside the lower end cover 5. The side of the flow equalization shell 501 facing the liquid inlet pipe 6 has a semi-circular structure, and several overflow ports 502 are opened at equal angles on the flow equalization shell 501. At the same time, several connecting pipes 503 are also evenly fixed on the flow equalization shell 501. The lower end face of the connecting pipe 503 is higher than the lower end face of the overflow port 502, and a sealing gasket 504 is fixed inside the connecting pipe 503. A frustum hole 505 is opened inside the connecting pipe 503, and the frustum hole 505 cooperates with the sealing plug 506 to realize the flow channel adjustment function; the sealing plug 506 The filter assembly 7 is fixed to the slide rod 507, and the slide rod 507 is connected to the support plate 508. The support plate 508 is fixed inside the connecting pipe 503. At the same time, the support plate 508 is fixed to one end of the first spring 509, and the other end of the first spring 509 is fixed to the slide rod 507. The filter assembly 7 includes an upper circular plate 701 fixed to the outer shell 1. An upper guide pipe 702 is evenly fixed on the upper circular plate 701. An upper limit ring plate 703 is also fixed to the lower end of the upper guide pipe 702. The upper limit ring plate 703 is slidably connected to the upper mounting plate 704. One end of the mounting plate 704 is fixed to one end of the ultrafiltration element 705, and the other end of the ultrafiltration element 705 is fixed to the lower mounting plate 706. A connecting rod 707 is fixed between the lower mounting plate 706 and the upper mounting plate 704. Connecting sleeves 708 are fixed on both the lower mounting plate 706 and the upper mounting plate 704. The connecting sleeves 708 and the ultrafiltration element 705 are distributed in a one-to-one correspondence. The connecting sleeves 708 on the upper mounting plate 704 are slidably connected to the upper guide tube 702. The lower mounting plate 706 is slidably connected to the lower limiting ring plate 713. 13 is fixed on the lower circular plate 714, and the lower circular plate 714 is fixed inside the outer shell 1. At the same time, the lower circular plate 714 is also evenly fixed with the lower guide pipe 715. The lower guide pipe 715 and the connecting sleeve 708 on the lower mounting plate 706 are slidably connected. The lower guide pipe 715 and the connecting sleeve 708 are distributed in a one-to-one correspondence. The lower guide pipe 715 and the connecting pipe 503 are nested. The lower guide pipe 715 and the connecting pipe 503 are distributed in a one-to-one correspondence. The lower guide pipe 715 is sealed with the connecting pipe 503 through the sealing gasket 504. When using this low-residue silica sol-specific ultrafiltration machine, such as Figures 1-8As shown, the inlet pipe 6 is first connected to the silica sol delivery pump via a conduit. The delivery pump then pumps the silica sol to be filtered and concentrated into the lower end cover 5 through the inlet pipe 6. At this time, the flow equalization shell 501 acts as a buffer for the high-speed silica sol. Due to the buffering effect of the flow equalization shell 501, the silica sol overflows along the outer wall of the flow equalization shell 501. As the silica sol level rises in the gap between the lower end cover 5 and the flow equalization shell 501, the silica sol enters the flow equalization shell 501 through the overflow port 502, causing the silica sol level inside the flow equalization shell 501 to rise. The silica sol rises, and because the lower ends of several connecting pipes 503 are flush, the silica sol can evenly enter the connecting pipes 503 and then enter the ultrafiltration element 705 through the connecting pipes 503 and the lower guide pipe 715 to achieve filtration. At this time, the water contained in the sol overflows outward through the ultrafiltration element 705 into the outer shell 1 and is discharged through the discharge pipe 2, thereby achieving the filtration and concentration of the sol. The filtered sol is discharged through the upper guide pipe 702 and the liquid outlet pipe 4, thus completing the first filtration and concentration of the sol. Based on the above principle, multiple devices such as... Figure 9 As shown, the series installation can achieve multiple filtration and concentration of the sol solution, ensuring the production quality of the sol solution; During device operation, when silica sol enters the lower guide pipe 715 and ultrafiltration element 705 through connecting pipe 503, if the surface of ultrafiltration element 705 is not blocked, meaning ultrafiltration element 705 can perform normal filtration, the flow of silica sol will exert force on sealing plug 506 and the circular plate at the end of slide rod 507, causing sealing plug 506 to move a certain distance towards frustum hole 505. At this time, sealing plug 506 and frustum hole 505 cooperate to form silica sol flow channel. When any ultrafiltration element 705 is blocked due to impurities adhering to its inner wall, the silica sol in that ultrafiltration element 705 will be blocked and cause silica sol to flow. Increased flow resistance reduces the flow rate of silica sol entering the corresponding ultrafiltration element 705 through the connecting pipe 503, thereby reducing the force on the circular plate at the end of the sealing plug 506 and slide bar 507 of the connecting pipe 503. Combined with the elastic action of the first spring 509, the sealing plug 506 and slide bar 507 can move in opposite directions, causing the sealing plug 506 to move away from the frustum hole 505. This increases the silica sol flow channel formed by the sealing plug 506 and the frustum hole 505, thereby increasing the amount of silica sol entering the connecting pipe 503. This achieves adaptive adjustment and ensures stable operation of the device. A horizontal plate 301 is fixed inside the upper cover 3, and a rotating shaft 302 is rotatably connected to the horizontal plate 301. A blade 303 is fixed to the upper end of the rotating shaft 302, and a fixing rod 304 is fixed to the lower end of the rotating shaft 302. An arc-shaped block 305 is fixed to the fixing rod 304. A guide rod 709 is also slidably connected to the upper mounting plate 704, and the guide rod 709 is slidably connected to the upper circular plate 701. A fixing plate 710 is fixed to the guide rod 709, and a convex shaft 711 is fixed to the fixing plate 710. The convex shaft 711 is slidably connected to the arc-shaped block 305. A second spring 712 is fixed between the fixing plate 710 and the upper circular plate 701. During the use of the device, such as Figures 1-8 As shown, when the silica sol is filtered, concentrated, and discharged through the outlet pipe 4, the flow of the silica sol causes the blade 303 to drive the rotating shaft 302 to rotate, thereby causing the fixed rod 304 and the arc block 305 to rotate. When the arc block 305 contacts and slides with the convex shaft 711, the convex shaft 711 is forced to move downward, thereby causing the fixed plate 710, guide rod 709, upper mounting plate 704, ultrafiltration element 705, and lower mounting plate 706 to move downward synchronously. Combined with the sliding guiding action between the guide rod 709 and the upper circular plate 701, and the sliding action between the lower guide pipe 715, the upper guide pipe 702, and the connecting sleeve 708, the upper mounting plate 704, ultrafiltration element 705, and lower mounting plate 706 can be ensured to move downward simultaneously. 6. Stability of movement: When the arc block 305 separates from the convex shaft 711, the upper mounting plate 704, ultrafiltration element 705, and lower mounting plate 706 can be reset under the elastic action of the second spring 712. Based on the above principle, through the continuous rotation of the arc block 305, combined with the sliding action between the arc block 305 and the convex shaft 711, the upper mounting plate 704, ultrafiltration element 705, and lower mounting plate 706 can vibrate up and down in an orderly manner. This can effectively prevent silica sol particles from adsorbing and clogging the ultrafiltration element 705, ensuring the filtration effect of the device. Moreover, during the vibration process, the supporting action of the connecting rod 707 can prevent the vibration from stretching and damaging the ultrafiltration element 705, ensuring the safe use of the device.

[0020] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A low-residue silica sol-specific ultrafiltration machine, comprising a shell (1), characterized in that: The outer shell (1) is fixed with a discharge pipe (2) on its side. The upper end of the outer shell (1) is connected to the upper end cover (3) by a flange and bolts. The upper end cover (3) is equipped with a liquid outlet pipe (4). The lower end of the outer shell (1) is connected to the lower end cover (5) by a flange and bolts. A pressure stabilizing and diverting mechanism is installed inside the lower end cover (5). The lower end cover (5) is equipped with a liquid inlet pipe (6). A self-vibrating and anti-clogging filter assembly (7) is installed inside the outer shell (1).

2. The low-residue silica sol-specific ultrafiltration machine according to claim 1, characterized in that: A horizontal plate (301) is fixed inside the upper cover (3), and a rotating shaft (302) is rotatably connected to the horizontal plate (301). A blade (303) is fixed at the upper end of the rotating shaft (302), and a fixing rod (304) is fixed at the lower end of the rotating shaft (302). An arc block (305) is fixed on the fixing rod (304).

3. The low-residue silica sol-specific ultrafiltration machine according to claim 2, characterized in that: The pressure stabilizing and diverting mechanism includes a flow equalization shell (501) fixed inside the lower end cover (5), and the side of the flow equalization shell (501) facing the liquid inlet pipe (6) is a semi-circular structure. The flow equalization shell (501) is provided with several overflow ports (502) at equal angles. At the same time, several connecting pipes (503) are also uniformly fixed on the flow equalization shell (501). The lower end face of the connecting pipe (503) is higher than the lower end face of the overflow port (502), and a sealing gasket (504) is fixed inside the connecting pipe (503).

4. The low-residue silica sol-specific ultrafiltration machine according to claim 3, characterized in that: The connecting pipe (503) has a frustum hole (505) inside, and the frustum hole (505) cooperates with the sealing plug (506) to achieve the function of flow channel adjustment.

5. The low-residue silica sol-specific ultrafiltration machine according to claim 4, characterized in that: The sealing plug (506) is fixed on the slide rod (507), and the slide rod (507) is connected to the support plate (508). The support plate (508) is fixed inside the connecting pipe (503). At the same time, the support plate (508) is fixed to one end of the first spring (509), and the other end of the first spring (509) is fixed to the slide rod (507).

6. The low-residue silica sol-specific ultrafiltration machine according to claim 5, characterized in that: The filter assembly (7) includes an upper circular plate (701) fixed to the outer shell (1), and an upper guide tube (702) is uniformly fixed on the upper circular plate (701). An upper limit ring plate (703) is also fixed at the lower end of the upper guide tube (702), and the upper limit ring plate (703) and the upper mounting plate (704) are slidably connected.

7. The low-residue silica sol-specific ultrafiltration machine according to claim 6, characterized in that: The upper mounting plate (704) is fixed to one end of the ultrafiltration element (705), and the other end of the ultrafiltration element (705) is fixed to the lower mounting plate (706). A connecting rod (707) is fixed between the lower mounting plate (706) and the upper mounting plate (704). At the same time, a connecting sleeve (708) is fixed on both the lower mounting plate (706) and the upper mounting plate (704). The connecting sleeve (708) and the ultrafiltration element (705) are distributed in a one-to-one correspondence. The connecting sleeve (708) on the upper mounting plate (704) is slidably connected to the upper guide tube (702).

8. The low-residue silica sol-specific ultrafiltration machine according to claim 7, characterized in that: The upper mounting plate (704) is also slidably connected to a guide rod (709) on the left and right, and the guide rod (709) is slidably connected to the upper circular plate (701).

9. A low-residue silica sol-specific ultrafiltration machine according to claim 8, characterized in that: A fixing plate (710) is fixed on the guide rod (709), and a convex shaft (711) is fixed on the fixing plate (710). The convex shaft (711) and the arc block (305) form a sliding connection. At the same time, a second spring (712) is fixed between the fixing plate (710) and the upper circular plate (701).

10. A low-residue silica sol-specific ultrafiltration machine according to claim 9, characterized in that: The lower mounting plate (706) and the lower limiting ring plate (713) are slidably connected, and the lower limiting ring plate (713) is fixed on the lower circular plate (714), and the lower circular plate (714) is fixed inside the outer shell (1). At the same time, the lower circular plate (714) is also uniformly fixed with a lower guide pipe (715). The lower guide pipe (715) and the connecting sleeve (708) on the lower mounting plate (706) are slidably connected, and the lower guide pipe (715) and the connecting sleeve (708) are distributed in a one-to-one correspondence. The lower guide pipe (715) and the connecting pipe (503) are nestedly connected, and the lower guide pipe (715) and the connecting pipe (503) are distributed in a one-to-one correspondence. The lower guide pipe (715) is sealed with the connecting pipe (503) through the sealing gasket (504).

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